js 统计字数，区分中英文

 var CheckLen  =function()
     {
    
       var len;
       var len0;
       var value=document.getElementById("txtAllInfo").value;
       Len=value.replace(/(\r\n)$/gm,'').split(''),len=len0=Len.length;
       for(o in Len)
       {
            if(Len[o].charCodeAt(0)>256)
            {
              len++;
            }
        }
        
        document.getElementById("spanCount").innerHTML="<b>"+len0+"</b>字符";//+len+'字节';
     }